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LED'S

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LED'S

  1. 1. Color Wavelength [nm] Voltage drop [ΔV] Semiconductor material ΔV < 1.63 Gallium arsenide (GaAs) Aluminium gallium arsenide (AlGaAs) 610 < λ < 760 1.63 < ΔV < 2.03 Aluminium gallium arsenide (AlGaAs) Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) Orange 590 < λ < 610 2.03 < ΔV < 2.10 Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) 2.10 < ΔV < 2.18 Gallium arsenide phosphide (GaAsP) Aluminium gallium indium phosphide (AlGaInP) Gallium(III) phosphide (GaP) 1.9[62] < ΔV < 4.0 Traditional green: Gallium(III) phosphide (GaP) Aluminium gallium indium phosphide (AlGaInP) Aluminium gallium phosphide (AlGaP) Pure green: Indium gallium nitride (InGaN) / Gallium(III) nitride (GaN) Infrared λ > 760 Red Yellow 570 < λ < 590 Green 500 < λ < 570
  2. 2. Zinc selenide (ZnSe) Indium gallium nitride (InGaN) Silicon carbide (SiC) as substrate Silicon (Si) as substrate—under development Blue 450 < λ < 500 2.48 < ΔV < 3.7 Violet 400 < λ < 450 2.76 < ΔV < 4.0 Indium gallium nitride (InGaN) multiple types 2.48 < ΔV < 3.7 Dual blue/red LEDs, blue with red phosphor, or white with purple plastic Ultraviolet λ < 400 3.1 < ΔV < 4.4 Diamond (235 nm)[63] Boron nitride (215 nm)[64][65] Aluminium nitride (AlN) (210 nm)[66] Aluminium gallium nitride (AlGaN) Aluminium gallium indium nitride (AlGaInN)—down to 210 nm[67] Pink multiple types ΔV ~ 3.3[68] Blue with one or two phosphor layers: yellow with red, orange or pink phosphor added afterwards, or white with pink pigment or dye. [69] White Broad spectrum ΔV = 3.5 Blue/UV diode with yellow phosphor Purple
  3. 3. Different sized LEDs. 8 mm, 5 mm and 3 mm, with a wooden matchstick for scale.

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